linux-kernel - Re: [PATCH] Revert 9fc2105aeaaf56b0cf75296a84702d0f9e64437b to fix pyaudio (and probably more)

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Message-ID: <alpine.DEB.2.11.1501081217390.25399@vincent-weaver-1.umelst.maine.edu>
Date:	Thu, 8 Jan 2015 12:22:02 -0500 (EST)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
cc:	Catalin Marinas <catalin.marinas@....com>,
	Vince Weaver <vince@...ter.net>,
	"nicolas.pitre@...aro.org" <nicolas.pitre@...aro.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	Marc Zyngier <Marc.Zyngier@....com>,
	kernel list <linux-kernel@...r.kernel.org>,
	"vincent.weaver@...ne.edu" <vincent.weaver@...ne.edu>
Subject: Re: [PATCH] Revert 9fc2105aeaaf56b0cf75296a84702d0f9e64437b to fix
 pyaudio (and probably more)

On Thu, 8 Jan 2015, Russell King - ARM Linux wrote:

> On Thu, Jan 08, 2015 at 04:41:12PM +0000, Catalin Marinas wrote:
> > On Thu, Jan 08, 2015 at 04:34:50PM +0000, Russell King - ARM Linux wrote:
> > > On Thu, Jan 08, 2015 at 04:19:08PM +0000, Catalin Marinas wrote:
> > > > I really think we should stop this thread. User ABI breakage fixed now.
> > > 
> > > No.  Vince's email shows a more serious problem.
> > > 
> > > The ABI breakage issue was reported before the patches were apparently
> > > merged, but that information seems to have been lost.  We need to
> > > understand how that happened so similar instances don't happen in the
> > > future.
> > 
> > FYI, searching for "Vince Weaver" and "bogomips" found this:
> > 
> > https://lkml.org/lkml/2013/7/11/454
> 
> Gah.
> 
> It looks like the report was made by hanging it into a totally different
> thread to the patches which caused the problem, and which went nowhere
> near the ARM kernel mailing lists.

yes, though by that point I had thought it was a done deal and so was 
mostly complaining about it with regard to another issue.

I usually don't hang out on the ARM lists, but perf-event related ones, 
which was why I was primarily discussing the issue with Will Deacon
in that case.

> One thing I still can't get my head around though is... Vince reported
> the breakage on 11 July 2013, but the patch is dated 30 August and I
> merged it 2 September.  So, how did Vince know about it to report the
> ABI breakage?  Had it been sitting somewhere else?

That's a good question.  Someone definitely had told me that is was going 
to happen earlier, but I can't remember where now.  Definitely someone 
with enough authority that I thought it wasn't worth the trouble 
complaining (I already seemingly have half the perf_event people annoyed 
with me on any given day, the last thing I wanted to do was get all of 
the ARM devs mad at me too).

Vince



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